Okay, so here's how I handled the history spiel. I wrote down all the different potential histories my character could have, using the rules. I've assigned each person where I think they would fit.

However, I am very, very, very big on not god-moding other people's characters, and I never want to sound like I'm bossing someone around when it comes to roleplay. If you think your character would fit somewhere else, or you would like something changed, please by all means feel free to offer suggestions. There are a few parts where I leave it open for you to fill in the details.

[i]* Your relationship with them has romantic potential. So far it hasn't gone further.[/i]

[i]* They're on the Agency's watch list, and you've been keeping an eye on them.[/i]

Alexander Huether 
[@Tally Dor]
Specifics: He's been on a watch list for a long time, but as Tally said, not a lot is on file about him. CASS is eager to learn more about him if need be. Keep in mind CASS doesn't want him dead necessarily - they're just curious to learn more about him and whether or not he's truly a threat.

[i]* You are related. Tell them how close.[/i]

Tiffany Graves. 
[@PatientBean]
Specifics: Tiffany and Julie are actually related through Tiffany's father: Julie is the daughter of one of his cousins.

[i]* You met them on a mission and worked together unofficially. And successfully.[/i]

Iustina Anghelescu
[@enmuni]
Specifics: Perhaps they met when Julie was investigating a potential vampire legend. They teamed up with Julie initially using a cover story, only for her to reveal her true identity after learning to trust Iustina. After they caught the vampire, Julie left Iustina to handle the rest.

[i]* They've worked with the Agency before, and they're well regarded.[/i]

[i]* You were friends back in training, before the Agency recruited you. This could be military, law enforcement, or some weirder school: decide the details between you.[/i]

[i]* They pulled you (and maybe your team) out of a terrible FUBARed mission.[/i]

Jordan 
[@Passable Writer]
Specifics: I imagined stepping in at a really rough moment at some time, even if it was a right-place-right-time situation. Feel free to offer any suggestions.

[i]* You got sent to "deal with them" as a hazard to the Agency's policies one time. Tell them how you resolved them.[/i]

Dr. Marion Lovelace 
[@TokyoPewpew]
Specifics: There was a time when it was believed she was getting too close to a creepypasta mission, and Julie was sent to see just how close she was. Thankfully, she actually wasn't involved.